The cosmic evolution of quasars at high redshifts

Details The cosmic evolution of quasars at high redshifts The cosmic evolution of quasars at high redshifts

Dec 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...170...37v&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 170, no. 1, Dec. 1986, p. 37-42.

Astronomy and Astrophysics

Astrophysics

6

Cosmology, Quasars, Red Shift, Space Density, Telescopes, Schmidt Telescopes

Scientific paper

An analysis of the redshift distribution of quasars is performed based on previous data to determine the density evolution in the 1.8-3.8 redshift range. Results show that the space density of high luminosity quasars increases quickly with redshift up to z of about 2.4-2.5, suddenly drops by about a factor of five at this redshift, and increases again by a factor of 8-10 between z of 2.5 and 3.8. The drop in space density noted at z of about 2.5 suggests the presence of two quasar populations, one born at z = 3.8 and one at z = 2.45, that both decrease quickly in space density.

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